Unfortunately, I don’t have a definitive solution for keeping snakes out of a pond. While there might be repellents available that are designed to deter snakes, I’m not sure which ones are effective or safe to use around ponds, especially in areas with aquatic life. It could also depend on the specific type of snake and local environmental factors.
I recommend researching snake deterrent products or consulting a local wildlife expert for advice tailored to your situation. They might provide guidance on safe and eco-friendly measures you can take to reduce snake activity around your pond.